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Error code reference

Bosch Washer Error Code E:04

Door lock doesn't lock

Bosch codesBosch washer codes

Door lock doesn't lock — jammed lock or bad wire harness.

First step from the service manual

Check door lock mechanism and wire harness for jamming or damage.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E:04 means on a Bosch washer

The E:04 error code on a Bosch washer indicates that the door lock mechanism has failed to engage or complete its locking cycle. The control board monitors the door lock assembly for a confirmation signal that the latch has fully secured. When that signal is absent or incorrect, the machine halts and displays E:04 to prevent operation with an unsecured door. This is a safety-critical system, and the washer will not begin or continue a cycle until the fault is resolved.

The two primary culprits are a mechanically jammed door lock assembly and a damaged or disconnected wire harness. A jammed lock can occur when debris, worn plastic components, or a misaligned door strike prevent the locking bolt from traveling fully into its seated position. A faulty wire harness, on the other hand, may deliver no signal or an intermittent signal to the control board even if the lock itself is physically functional. Both conditions produce the same error code, so physical inspection of both the mechanism and the wiring is necessary to isolate the root cause.

Begin diagnosis by examining the door lock mechanism for any visible obstruction, deformation, or wear on the latch and strike plate. Then trace the wire harness connecting the door lock assembly to the main control board, checking for pinched wires, corroded terminals, or loose connectors. A functioning lock assembly should engage smoothly and produce an audible click when the door closes firmly.

Source: manufacturer service documentation.

Common causes of E:04

  1. 01

    Jammed or obstructed door lock mechanism

    Part replacement

    Debris, worn internal components, or a misaligned door strike can prevent the locking bolt from fully engaging. Inspect the lock assembly and door strike for physical obstructions or deformation.

  2. 02

    Damaged or disconnected wire harness

    Wiring / connection

    The wiring between the door lock assembly and the control board may be pinched, corroded, or unplugged, preventing the lock confirmation signal from reaching the board. Trace the harness and check each connector for damage or looseness.

  3. 03

    Worn or failed door lock assembly

    Part replacement

    Internal components of the lock assembly, such as the solenoid or locking tabs, can wear out over time and fail to complete the locking action. If the mechanism moves sluggishly or not at all, the assembly likely needs replacement.

  4. 04

    Misaligned door or hinge

    Wiring / connection

    A sagging door or bent hinge can cause the door latch to miss the strike plate, preventing proper engagement. Check that the door closes evenly and the latch aligns correctly with the strike opening.

See the test procedure for each cause

Frequently asked questions about E:04

What does E:04 mean on a Bosch washer?
E:04 means the washer's door lock did not successfully engage when a cycle was started. The control board requires a confirmation signal from the door lock assembly before allowing the machine to run. The cause is typically a jammed lock mechanism or a damaged wire harness connecting the lock to the control board. The washer will remain non-operational until the fault is corrected.
Can I fix E:04 on my Bosch washer myself?
In many cases, yes. Start by inspecting the door lock mechanism for visible debris or obstruction and clear anything blocking the latch. Also check the wire harness for loose connectors or visible damage. If the lock assembly itself is worn or broken internally, replacing it is a straightforward repair for someone comfortable working with appliances, though it does require purchasing a replacement part.
Is it safe to use my Bosch washer when E:04 is displayed?
No, the washer should not be operated while E:04 is active. The error indicates the door lock has not confirmed a secure seal, and running a wash cycle without a properly locked door creates a risk of water leaking from the door. The washer's control system intentionally prevents the machine from starting for this reason.
How much does it cost to repair a Bosch washer showing E:04?
If the fix involves only adjusting or clearing an obstruction in the door lock, the cost may be minimal. Replacing a door lock assembly typically costs between $30 and $100 for the part, plus labor if you use a technician, which can bring the total to a range of $100 to $250 depending on your location and service provider. Repairing or replacing a damaged wire harness falls in a similar range depending on the extent of the damage.
Will resetting my Bosch washer clear the E:04 error?
A reset may temporarily clear the error code from the display, but it will return as soon as the washer attempts to lock the door again for a new cycle. Because E:04 reflects an actual mechanical or electrical fault rather than a software glitch, the underlying issue with the door lock or wire harness must be diagnosed and corrected before the error will stay cleared.

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